brush off
phrasal verbbrush off 
- to be removed by brushing被刷掉;被拂去 - Mud brushes off easily when it is dry.泥巴干了容易刷掉。 
 
- Mud brushes off easily when it is dry.
brush somebody  off 
- to rudely ignore somebody or refuse to listen to them不理睬某人;打发 - She brushed him off impatiently.她不耐烦地把他打发走了。 
 
- She brushed him off impatiently.
brush somebody/yourself off 
(British English brush somebody/yourself down)
- to make somebody/yourself tidy, especially after you have fallen, by brushing your clothes, etc. with your hands掸净某人/自己,拂去衣服上的灰尘(尤指跌倒后)